3 down
A
worm
tries
wriggling
but
it
always
goes
forward
(5,5)
A worm tries wriggling but it always goes forward (5,5)
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The definition is at the end of the clue.
How the clue works
Right, so but it always goes forward is the definition — that's your time's arrow, always pointing on to the future. Then "wriggling" is the anagram signal, telling you to shuffle the letters of "A worm tries" to get TIMES ARROW.